Item12596: Prepare for 1.1.9-RC2

New fixes to release notes.

Revise release notes headings  a bit to make it clearer which changes are in
a release.

git-svn-id: http://svn.foswiki.org/branches/Release01x01/core@17044 0b4bb1d4-4e5a-0410-9cc4-b2b747904278